Sound deadening sheet material

Abstract

Abstract A UNITARY LIMP SHEET OF SOFT, RESILIENT, CLOSED CELL, FORMED THERMOPLASTIC POLYVINYL CHLORIDE HAVING DISTRIBUTED THERETHROUGH PARTICULATE MATTE OF IRREGULAR SHAPE, OF SPECIFIC GRAVITY OF 3.0 AND UP, AND OF SIZES RANGING FROM 40 TO 200 MESH. THE RATIO, BY WEIGHT, OR THE POLYVINYL CHLORIDE TO PARTICULATE MATTER IS ABOUT 1 TO 6. THE PARTICLES ARE INDIVIDUALLY BONDED TO SHEET MATERIAL AND HELD THEREBY IN SPACED RELATION TO EACH OTHER THROUGHOUT THE MASS AND ISOLATED FROM EACH OTHER BY THE SHEET MATERIAL AND CELLULAR SPACES. THE SHEET IS FROM 1/8 TO 1/4 INCH THICK, WITH A SUPERFICIAL THIN SKIN ON OPPOSITE FACES. THE SKIN ON ONE FACE IS PERFORATED MECHANICALLY BY TEARING IT TO PARTIALLY SHRED IT AND SUPERIFICIAL JUXTAPOSED STRATUM OF THE BODY OF THE SHEET TO PRODUCE A FIBROUS SURFACE ON THAT FACE. THE SHEET IS FORMED BY PLACING IN AN EXTRUDER A MIXTURE OF THE VISCO-ELASTIC SEMI-PLASTIC BINDER POWDER, A FOAMING AGENT POWDER, AND THE HIGH DENSITY PARTICLES; EXTRUDING THE MIXTURE UNDER HEAT BY WHICH IT IS MELTED TO A FLOWABLE SEMI-PLASTIC MASS WHICH IMMEDIATELY BEGINS FOAMING. THE EXTRUSION IS FED INTO CALENDAR ROLLS AND SIZING ROLLS AND THEREFROM PASSES ONTO A BELT WHEREIN THE FOAMING CONTINUES UNTIL A SHEET OF THE DESIRED WIDTH AND THICKNESS IS PROVIDED.

Inventors

• 👤 John H Rauh

Bibliographic Details